21154521546444 has 96 divisors (see below), whose sum is σ = 58120922168064. Its totient is φ = 5903991025920.

The previous prime is 21154521546427. The next prime is 21154521546493. The reversal of 21154521546444 is 44464512545112.

It is a junction number, because it is equal to n+sod(n) for n = 21154521546393 and 21154521546402.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13153819 + ... + 14674194.

It is an arithmetic number, because the mean of its divisors is an integer number (605426272584).

Almost surely, 2^{21154521546444} is an apocalyptic number.

It is an amenable number.

21154521546444 is an abundant number, since it is smaller than the sum of its proper divisors (36966400621620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21154521546444 is a wasteful number, since it uses less digits than its factorization.

21154521546444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27828487 (or 27828485 counting only the distinct ones).

The product of its digits is 3072000, while the sum is 48.

The spelling of 21154521546444 in words is "twenty-one trillion, one hundred fifty-four billion, five hundred twenty-one million, five hundred forty-six thousand, four hundred forty-four".